function_exists
Description
Return true if the given function has been defined
Syntax
function_exists(string $function): bool
Parameters
functionThe function name, as a string.
Return
Returns true if function exists and is a function, false otherwise.
Note: This function will return false for constructs, such as include_once and echo.
Examples
1
<?
function myfunction()
{
}
$function = "myfunction";
$return = function_exists($function);
var_export($return);
?>true
